// Copyright 2007, 2008 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.util;

 import org.apache.tapestry5.ValueEncoder;

 import static org.apache.tapestry5.ioc.internal.util.Defense.notNull;

 import org.apache.tapestry5.ioc.internal.util.InternalUtils;

 /**

  * A value encoder that can be used for aribrary Enum types. The enum name is stored as the client side value.

  */

 public class EnumValueEncoder<E extends Enum<E>> implements ValueEncoder<E>

 {

     private final Class<E> enumType;

     public EnumValueEncoder(final Class<E> enumType)

     {

         notNull(enumType, "enumType");

         this.enumType = enumType;

     }

     public String toClient(E value)

     {

         if (value == null) return null;

         return value.name();

     }

     @SuppressWarnings("unchecked")

     public E toValue(String clientValue)

     {

         if (InternalUtils.isBlank(clientValue)) return null;

         return Enum.valueOf(enumType, clientValue);

     }

 }